Part Number: MPM3506AGQV-Z

Manufacturer: Monolithic Power Systems (MPS)

Description: Switching Voltage Regulators 36V/0.6A Module Sync Step-Down Converter

Shipped from: Shenzhen/HK Warehouse

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MPM3506AGQV-Z Description

The MPM3506A is a synchronous, rectified step-down converter with a power MOSFET, an inductor, and two capacitors integrated into a single package. It’s a compact solution requiring only 4 external components and can maintain a continuous 0.6A output current with excellent load and line regulation over a wide input supply range. With a switching frequency of 1.15MHz, the MPM3506A can provide an instantaneous transient response to changes in the applied load. Both thermal cutoff and overcurrent protection (OCP) is part of a comprehensive set of safety measures (TSD). Compared to competing solutions, the MPM3506A drastically shortens launch times by removing design and production bottlenecks. Since the MPM3506A is housed in a compact QFN-19 (3mm x 5mm x 1.6mm) packaging, there is more room for other components.

MPM3506AGQV-Z Features & Benefits

  • Completed the Switch-Mode Energy supply.
  • Input Voltage Range of 4.5V to 36V for Maximum Flexibility in Use.
  • Constant 0.6A Current Under Load.
  • Internal power MOSFETs with a low RDS(ON) of 90mO/60mO.
  • A constant of 1.15 MHz is used for switching.
  • In-phase synchronization at 800kHz and 2MHz.
  • Low-Utilization Power Saving Mode.
  • Extremely Good News.
  • One-Click Pause with Hiccup and Valley Current Detection.
  • temperature-controlled shutoff
  • The output voltage may be adjusted from 0.8V to 1.6V, and the QFN-19 package (3mm x 5mm x 1.6mm) makes this possible.
  • The total Solution is 6.7 mm × 6.3 mm in size.

MPM3506AGQV-Z Applications

  • Industrial Controls
  • Automotive
  • Medical and Imaging Equipment
  • Telecom Applications
  • LDO Replacement
  • Space and Resource-Limited Applications
  • Distributed Power Systems


The MPM3506A is a high-frequency, rectified, synchronous, step-down switch-mode converter with built-in power MOSFETs, inductors, and capacitors. It offers a compact solution with high load and line regulation from 4.5V to 36V input supply and a stable 0.6A output current. The MPM3506A operates in a fixed frequency, peak current mode to regulate the output voltage.

A PWM cycle is started by an internal clock. This integrated high-side power MOSFET (HS-FET) turns on and maintains its on state when the current meets the value set by the COMP voltage. The power cutoff is permanent, lasting until the next clock cycle begins. If the COMP value-determined current through the HS-FET does not exceed the threshold within 92% of a PWM cycle, the HS-FET is disabled.

● Internal Control Mechanism

A 5V internal regulator provides power for the majority of the internal electronics. This regulator fully supports the VIN range. When VIN is higher than 5.0V, the regulator’s output is perfectly regulated. If VIN is less than 5.0V, the output will decrease. Because of the included decoupling capacitor, an additional external VCC output capacitor is unnecessary.

● Using AAM in a Situation

The MPM3506A includes a high-efficiency power-saving mode called advanced asynchronous modulation (AAM) that operates under low loads. Constant arithmetic amplification voltage (VAAM) is used internally. The inbuilt 250mV AAM voltage controls the transition point from AAM to PWM. When the load is great, the VCOMP goes beyond the VAAM.

When VCOMP goes above VAAM, the system time is resynchronized. When a load is light, VCOMP has a low value. When VFB is less than VREF and VREF is less than VAAM, VCOMP increases until it is greater than VAAM. When the internal clock of the MPM3506A is disabled, it enters a power-saving mode called pulse frequency modulation (PFM), which allows it to function under low loads with minimal energy consumption.

● A broken amplifier (EA)

The error amplifier produces a current proportionate to the delta between the FB voltage and the 0.81V internal reference (VREF). The COMP voltage is generated by charging or discharging the internal compensation network with the output current (which controls the power MOSFET current). The streamlined internal compensation network reduces the complexity of the control loop design and the number of external components required.

● Disabled because of Low Voltage Lockout (UVLO)

An under-voltage lockout prevents the chip from operating with an insufficient power supply (UVLO). MPM3506A UVLO comparator monitors the output voltage from the built-in regulator (VCC). The thresholds for the UVLO’s up- and down-states are 4.05V and 3.65V, respectively.


Digital control pin EN/SYNC activates and deactivates the regulator. To turn on the regulator, set EN/SYNC to high, and to turn it off, set it to low. It is possible to turn off the chip by floating the EN/SYNC pin, which is connected to GND through an internal 1M resistor. A Zener diode in series with 6.5V is used internally to clamp the EN/SYNC signal (see Figure 3). By connecting the EN/SYNC input to the voltage on VIN through a pull-up resistor, the current through the EN/SYNC input is limited to less than 100 A.

When VIN is powered by 12V, for instance, PULL-UP = (12V – 6.5V) 100A, yielding a value of 55k. In the absence of a pull-up resistor, the Zener diode must be protected by limiting the amplitude of the voltage source to no more than 6V when EN/SYNC is connected directly to it.

● Inside Light the Fire With a Baby Candle (SS)

The converter’s output voltage won’t surge prematurely thanks to the soft start. When powered on, the chip generates a soft-start voltage (SS) that gradually increases from 0V to 5V via its internal circuitry. If SS is less than VREF, the error amplifier will use SS as its reference. When SS is larger than VREF, the error amplifier will use VREF as its reference. The SS time is initially configured internally to be 1.3 ms.

● Overcurrent and hiccup protection

The MPM3506A has a peak current limit and a detector for valley currents. The current in the inductor is measured while the HS-FET is in its “on” state. Suppose the current via the inductor reaches the value specified by the COMP high-clamp voltage. In that case, the HSFET immediately turns off as the low-side MOSFET turns on to discharge the energy, and the current in the inductor drops.

As long as the inductor valley current is below a certain threshold, the HS-FET will remain off regardless of how fast or how often the internal CLK pulses high (the valley current limit). If the inductor current does not decrease below the valley current limit when the CLK pulses high, the HS-FET will miss the CLK, and the switching frequency will drop to half its nominal value.

The valley  and peak and current limitations keep the inductor current contained during an overload or short circuit. Suppose the output voltage drops below the undervoltage (UV) threshold, which is 50% below the reference voltage. In that case, the MPM3506A will often enter hiccup mode and periodically restart the part (simultaneously, the peak current limit is kicked). When the output is shorted to ground, this protection mode helps prevent heat issues and protect the regulator. The MPM3506A exits hiccup mode after the overcurrent issue is fixed.

● Reduced temperature (TSD)

The chip’s thermal shutdown prevents it from operating in an unsafe environment. When the die hits 165 degrees Celsius, the switch-stopping device is triggered. The power supply is ready to go again when the temperature drops below the average low point, around 145 degrees Celsius.


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Kevin Chen